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RE: How much water should you drink to hydrate your body?
Caffeine inhibits anti-diuretic hormone which means that it will make you urinate more and thus likely has a net negative hydrating effect on your body if it causes you to urinate more water then what it consumed.
Caffeine is also fairly acidic on your body and your urinary system is a major way to get ride of metabolic acids. So coffee and water are most definitely not equal when trying to hydrate.
You'r right. It is not equal. That's why it is written there that coffee shouldn't be taken excessively. Yet it is loaded with some amount of water.